Alters' differences in physical processes?

Thank you all for the replies! I was very curious to know actually how common are these physical differences between alters. Your replies are all really interesting.

For us we noticed a bunch of stuff that made us think about this question. Is a sort of list that goes sort of for alter per alter:

- Nico has sensory issues, that (if we really have it) might be connected to our ASD. He hears a lot more clearly and is quickly alerted by loud sounds, mainly voices. Sometimes he goes mad because there's too much noise around him and our ears feel like they're being scratched. He also sees too much light, so he always has frowned eyebrows and squeezes his eyes quite often. He also feels tastes more, and that's why he doesn't like to eat. He also doesn't like to be touched at all, but has a really high tolerance of pain in comparison to all of us. He stands cold extremely well. These are all really ironic if I think of the fact that he was a wolfdog before "turning human".
- Xavier has less coordination and is more clumsy than most of us. He's the one that doesn't see cars when crossing the street and that doesn't hear people when they're talking. He's also the one that stumbles a lot when he walks. We also suspect he has higher blood pressure, and he is the one that doesn't ever feel fatigued. He stands hot weather well.
- JR is very sensitive to smells. He also has a high pain tolerance.
- Jason seems to suffer a lot from tachycardia. It might be because of his anxiety.
- I have the lowest pain tolerance out of all of us we think. It still has to be proven somehow...
- We also had a really strange thing with peanut butter. We used to have jelly and peanut butter sandwiches, but one day we ate one and we felt very sick afterwards. We felt nauseous for the whole evening. We tried again some days later, and it happened again. It was either Nico or Xavier, but we still have to try out if somebody is intolerant to peanuts or if it was just a weird thing that happened.

For now it's just this that we've noticed!

Thank you again for the replies and keep on writing if something else comes to our mind. We are very interested.